Resident Population in Mercer County, WV was 57.52400 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Mercer County, WV reached a record high of 74.60000 in January of 1979 and a record low of 57.52400 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Mercer County, WV - last updated from the United States Federal Reserve on April of 2026.